Some coats have buttons that have an interesting quality.
The metal buttoning coat has 2 parts: the hollow part (female), and
the solid part (male). The hollow part is like a metallic hole in the coat.
If you zip up the coat and leave one button undone, then stick your
head inside the dark coat, you will see an upside-down image
of the world on your belly.
This is because of the metallic pinhole in the coat, which focuses light
I tell of this, so you might add it to your experiments on your website.
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